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There are a few things that I would assume is causing your email to land in the spam box. Since your question is short on the details of the email, I will answer it as best as a I can based on assumptions.

Also I've used SendGrid successfully in the past, good service!

These are not in order of importance!

The first to look for is the ratio of 'Text' to 'Images'. 2 lines of text for every image. Image size file size can affect this also. Send grid recommends that you only use images if you have to.

Yes, I am having issue with only links of one website. But remaining links are fine
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VinayMar 26 '13 at 3:51

One more thing I am successfully sending emails with the same links using Gmail, It works fine, all the e-mails are landing in INBOX, But when i use the sendgrid, All the emails will land in SPAM, What is the exact cause for thi.
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VinayMar 26 '13 at 4:08

Are you adding a text-only version to the email?
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JoeyHMar 26 '13 at 15:51

yes, I have added. Earlier it was missing.I added it now
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VinayMar 27 '13 at 4:50